import processing.serial.*;

// The serial port:
Serial myPort;     
int lf = '\r';
String myString = null;

void setup() {
  // List all the available serial ports:
  println(Serial.list());
  
  /*  I know that the first port in the serial list on my mac
  is always my  Keyspan adaptor, so I open Serial.list()[0].
  Open whatever port is the one you're using.
  */
  myPort = new Serial(this, Serial.list()[2], 9600);
  
}

void draw() {
  while (myPort.available() > 0){
    myString = myPort.readStringUntil(lf);
    if (myString != null){
      println(myString); 
    }
  } 
}
